Rather than 20 full-time jobs we need to fill them with 40 part-time jobs and then those 40 people work part-time on other interests (their own start up, works of passion, another job to bring in the money, etc.)
Unfortunately there are still returns to scale. To stay on top of everything in your field|industry|organization might take 20 hours a week so some jobs aren't manageable on a part time basis.